VOA慢速英语:科学家发现最古老的澳大利亚有袋类动物

mammal -n. a type of animal that feeds milk to its young and that usually has hair or fur covering most of its skin

forelimb -n. an arm, fin, wing, or leg that is located toward the front of the body

pouch -n. a pocket of skin on the stomachs of some female animals (such as kangaroos and koalas) that is used to carry young

allow -v. to permit; to let

sedge -n. a plant like grass that grows in wet ground or near water